docs: def pckfrm(pck, ids):
      """
      Find the set of reference frame class ID codes of all frames
      in a specified binary PCK file.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/pckfrm_c.html
  
      :param pck: Name of PCK file.
      :type pck: str
      :param ids: Set of frame class ID codes of frames in PCK file.
      :type ids: SpiceCell
      """
      pck = stypes.stringToCharP(pck)
      assert isinstance(ids, stypes.SpiceCell)
      assert ids.dtype == 2
      libspice.pckfrm_c(pck, ctypes.byref(ids))